Side-by-side specifications of the Synology DS213 and DS213+, from official datasheets. Differences are highlighted.
| DS213 | DS213+ | |
| CPU | unknown | Marvell Armada XP MV78230 dual-core 1.0 GHz |
| Cores / threads | unknown | 2 cores / 2 threads |
| RAM (base) | unknown | 512 MB DDR3 |
| RAM (max) | unknown | 512 MB |
| Drive bays | 2 | 2 |
| Expandable to | 0 | 0 |
| M.2 slots | 0 | 0 |
| Network | 1× Gigabit | 1× Gigabit Ethernet |
| 10GbE | no | no |
| Max raw capacity | 8 TB | 8 TB (2×4 TB) |
| Hot-swap | yes | yes |
| Form factor | tower | tower |
| Released | 2012 | 2013 |
| Power consumption | — | 18.4 W / 2.6 W |
| DSM at launch | — | 4.2 |
Choose the DS213+ if you want noticeably more headroom: it has the faster CPU, more RAM, and better overall performance for apps, multitasking, and heavier SMB use. Both are 2-bay NAS units with no expansion capability, and neither model supports 10GbE or M.2. Pick the DS213 only if you need the cheapest basic file storage; otherwise the DS213+ is the safer buy.